Yes, nine holes count
Under the World Handicap System a nine-hole round counts toward your handicap. Since the 2024 update to the rules it counts right away: your nine-hole score is combined with an expected score for the other nine, based on your handicap, to make an 18-hole score differential. Before that, in the US and most other places, a nine-hole score had to wait for a second one to pair with.
How a nine becomes an 18-hole differential
- Cap each hole at net double bogey, using your strokes for nine holes (below). That's your adjusted nine-hole score.
- Work out the nine-hole differential: (score − the nine's course rating) × 113 ÷ the nine's slope.
- Add the expected differential for nine holes at your handicap. The total is the 18-hole differential that goes on your record.
A 45 on a front nine rated 35.8 with a slope of 126: (45 − 35.8) × 113 ÷ 126 = 8.3 for the nine. The expected score for the other nine is then added to make the 18-hole differential.
Your strokes for nine holes
Use half your handicap with the nine's rating, slope and par:
Strokes for nine = (handicap ÷ 2) × slope ÷ 113 + (nine's rating − nine's par)
A 14.2 on that front nine, par 36: 7.1 × 126 ÷ 113 + (35.8 − 36) = 7.7, so 8 strokes, on the eight hardest holes of the nine.
Every rated course has a rating and slope for each nine, but not every scorecard prints them. If yours only has 18-hole numbers, use half the 18-hole rating with the 18-hole slope, which is what the Strokes Calculator's Front 9 and Back 9 settings do.
Stroke index on nine holes
The stroke index on a card runs 1 to 18 across both nines. On nine holes, rank the nine you're playing by their stroke index and give strokes to the hardest first. Many cards put the odd numbers on one nine and the even numbers on the other, so the strokes spread evenly.
Nine-hole courses
A course with only nine holes is rated as nine holes, so its course rating is in the 30s instead of around 70. Everything above works the same way, using its rating and slope as they are.
Updated November 13, 2026 by the Greens team.